Drawing-off mechanism for a loom and a method for the weaving of cloth on a loom



FePo. 18, 195% J. RABEUX ET AL 2,823,707

DRAWING-OFF'MECHANISM FOR A LOOM AND A METHOD FOR THE WEAVING OF CLOTH ON A LOONI 3 sheet t 1 Filed Nov. 4, 1954 FIG 2 IN VENT OR JEAN RABEUX BERNARD MASSON Feb. 18, 1958 J. RABEUX ETAL 2,823,707

DRAWING-OFF MECHANISM FOR A LOOM AND A METHOD FOR THE WEAVING OF CLOTH ON A LOOM Filed Nov. 4, 1954 a Sheets-Sheet 2 FIG?) INVENTOR. JEAN RABEUX .BERNARD MASSON J. RABEUX 2,823,707

A LOOM AND A METHO Feb. 18, 1958 ET AL DRAWING-OFF MECHANISM FOR FOR THE WEAVING OF CLOTH ON A LOOM 3 Sheets-Sheet 3 Filed Nov. 4, 1954 I I i I F 4 HIM Ini FIG. 4

' INVENTOR. JEAN RABEUX- BERNARD MASSON United States Patent Of" DRAWING-OFF MECHANISM FOR A LOOM AND A METHOD FOR THE WEAVING or, CLOTH ON A LOOM i 8 Jean Rabeux, Paris, and Bernard Masson, Courbevoie, France, assignors to Societe dApplications Generales dElectricite & tle Mecanique, Paris,- France Application November 4, 1954, Serial No. 466,798 Claims priority, application France November 6, 1953 3 Claims. (Cl. 139- 309 This invention relates to looms, and more particularly to the mechanism for drawing oif a tubular fabric woven on a circular loom.

Applicants copending U. S. patent application filed on January 4, 1954 for A Loom, Ser. No. 402,188 dis of the drawing-off mechanism, the weaving may continue only for a very shorttime without difficulty.

An object of the invention is to provide a drawing-off mechanism for any kind of looms, especially, however, for circular looms, by means of which the drawbacks of the hitherto known drawing-off mechanisms are overcome.

Another object of the invention is to provide a drawingoif mechanism for looms by means of which zones with a density of the Weft other than the normal density of the weft of the cloth may be automatically obtained by a change in the speed of the drawing-off operation without a stoppage of the weaving operation.

A, further object of the invention is to provide a drawing-oft" mechanism for looms by means of which such zones with different density of the weft may be automatically repeated at equal or unequal distances.

Still another object of the invention is to provide a drawing-01f mechanism for looms by means of which the size of the zones with different density of the weftma be controlled.

A further object of the invention is to provide a drawing-oif mechanism for looms by means of which the density of the weft in each zone of a diiferent' density of Fig. 2 is a fragmentary top plan view of the drawing oif rollers and a train of gears connected therewith of the mechanism shown in Fig. 1, V

Fig. 3 is a somewhat diagrammatical elevational view of the controlling device for the mechanism shown in Fig. 1, and

Fig. 4' is a perspective view of the the entire apparatus incorporating the structure illustrated in Figs. l-3.

Referring now to Figs. 1 and 2, a pair of draw-off rollers land 2 drawing off the tubular cloth 30 woven by implements of ,a circular loom are driven by the shaft 3 through the medium of a mechanism to be described herematter at a speed depending on the speed of the shuttles of the loom. Preferably, the shall 3 is" driven by the 2,823,707 Patented Feb. 18, 1958 main shaft (not shown) of the loom through the medium of a train of gears (not shown). Furthermore, preferably, said train of gears is exchangeable, so that the basic or normal density of the weft in the fabric to be woven by the implements ofthe'loom and to be drawn oif by the draw-off roller 1, 2 may be selected by selecting a train of gears with a certain ratio of transmission whereby the speed of the shaft 3 and thus of the rollers 1 and 2 is set in a predetermined relation to the speed of the shuttles. Thus, the relation between the speed of the draw-off rollers 1 and 2 and the speed of the shuttles can be modified in a similar manner as it can be done in the device disclosed in said U. S. patent application Ser. No. 402,188 for modifying the basic or normal density of the weft in various cloths to be woven.

'A center clutchelement 4 of a claw coupling 32 is slidably mounted on the shaft 3. Said clutch element 4 is permanently rotated by the shaft 3 through the medium of a key or the like.

The clutch element 4 may be operatively engagedeither with the clutch element Sattached to the pinion 35 or with the clutch element 6 attached to the pinion 36. Thus, the shaft 3 drives either the pinion 35 or the pinion 36 depending: on the position of the speed adjusting element 4 of the clutch 32.

Furthermore, the shaft 9 is driven either by the train of gears 35, 7, 8 or by the train of gears 36, 10, 11 depending on the position of the clutch element 4.

Thu-s, the shaft 9 may be driven at different speeds as the ratio of the train of gears 35, 7, 8 is other than that of the'train of gears 36, 10, 11.

The shaft 9, in turn, drives the draw-off rollers 1 and 2 by means of a reduction train of gears, i. e. the pinions 12,13, 14, the worm 15, the worm gear 16 and the gears 17, 18 The pinion 1 2 keyed to the shaft 9 is in mesh with the pinion 13 which meshes with the pinion 14 keyed to the shaft 33 carrying the worm 15. The worm gear 16 in mesh withthe worm 15 is keyed to a shaft 34 (see Figs. 1 and 2) rigidly connected with the roller 1 and the gear 17. The gear 17 is in mesh with the gear 18 secured to the shaft 37 rigidly connected with the roller 2.

As will be readily understood from above, depending on the position of the element 4 of the clutch 32 two different speeds of rotation of the draw-off rollers 1 and 2 may be obtained at one and the same speed of rotation of the shaft 3, so that two difierent densities of weft may be produced in the cloth.

The shiftable clutch element or speed adjusting element 4 is Controlled by a fork 19 swingably mounted on a bracket 38' at 39. Thefork 19 may be held in the position shown in Fig. 1 by means ofa spring 21 for engagement of the clutch element 4 with the clutch element 6; Upon an energization of an electromagnet 20, the fork 19 may be swung in counter-clockwise direction. against the action of the spring 21 by means of the armature 40 for engaging the clutch element 4 with the clutch element 5. l

The electromagnet 20 is deenergized and the clutch element 4 is pulled downwardly into operative engagement with the clutch element 6 by means of the spring 21 acting on the fork 19 as long as cloth with a normal tion of the normaly narrow zones with higher density of weft; then, the clutch member 4 is held. in operative engagement with the clutch member 5 by the action of the electromagnet 20.

The length of the Zone with higher density of weft depends on the number of rotations of the loom during the energization; of the electromagnet 20.

The distance between two successive zones with higher 3 density of weft depends on the number of rotations of the loom during the deenergization of the electromagnet 20.

The closing and Opening of the contact 23 (see Fig. 3) electrically connected with the electromagnet by means of the wire 41 is controlled by a cam 22 mounted on a rotatable disk 27.

The length of a zone with higher density of weft is determined by the degree of the angle corresponding to the active zone of the cam.

The cam 22 shown in Fig. 3 has only a single zone of action. The disk 27 carrying the cam 22 is rotated by means of a toothed Wheel 24 through the medium of the pinions 25 and 26, said toothed wheel 24 being in engagement with the cloth drawn off by the rollers 1 and 2.

The zones with higher density of weft are repeated at each revolution of the disk 27. Thus, the distance between two zones is equal to the developed length of the toothed wheel 24 multiplied by the ratio of the pinions 25 and 26. The length of each zone equals to a fraction of said distance in accordance with the fraction of the revolution represented by the active zone of the cam 22.

It will be readily understood that a great number of combinations may be obtained by means of the abovedescribed controlling mechanism.

If a cam having a plurality of active zones of different sizes spaced from each other at unequal distances is used, a series of bands of different lengths spaced from each other at unequal distances may be obtained.

The length of the cloth containing such an elementary series of bands may be shortened or lengthened by changing the toothed disk 24.

Cloths produced by means of above described device have the following characteristics: they have a higher resistance in the particular zones, they have a higher watertightness and a better appearance in said zones, and they have a pattern which may be made in any desired manner.

For example, if a cloth for use in the fabrication of sacks or bags is woven, the reinforcements (zones with higher density of weft) may be arranged in the following manner: in the zone where the strain caused by the Weight of the product enclosed in the sack is at a maxi mum (for example in the case of a fall), in that part of the cloth which shall be used as the bottom of a sack or the like and, therefore, is worn away very fast by contact with the ground during various manipulations, in the region where a seam is necessary for the shape of the sack or where the sack wears out the most during the filling and closing thereof. A reinforcement at the mouth of the sack is very useful as this zone is subject to the tightening by straps or the like during the automatic filling and as in the case of a closure by a rolled scam the weft threads shall not move away from each other in said zone when the filled sack is successfully lifted.

Thus, the use of a device according to the invention permits the manufacture of an economical sack for an increased quality as the, material is utilized in a rational manner.

Furthermore, many other examples of use of the device according to the invention may be found in industrie]: other than the industry for the manufacture of sac s.

A device according to the invention may be successfully used when the cloths are subject to uneven strains in accordance with their way of use or finishing: seam lines, eyelet lines, zone of maximum strains, zone of wear and tear, etc.

We have described a preferred embodiment of our invention, but is is understood that this disclosure is for the purpose of illustration and that various omissions or changes in p proportion and arrangement of parts,

as well as the substitution of equivalent elements for those, herein shown and described may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

For example, the device according to the invention could be equipped with a magnetic clutch instead of the claw coupling 32 described above; in such a case, the fork 19 and the electromagnet 20 and spring 21 acting thereon could be omitted.

Furthermore, the device according to the invention could be equipped with a stepless change speed trans mission, wherein the speed of the driven element may be varied between a maximum value and a minimum value and wherein the means for adjusting the speed is controlled by an electric motor.

Moreover, the controlling mechanism of the device according to the invention could be made in an entirely different manner. For example, the controlling mechanism could be actuated by means of an element rotating in synchronism with the movement of the drawing-01f mechanism, by making use of a weft counter or by making use of any other counter capable of transmitting signals to a relay assuring the control of the drive of the device by means of combinations of photo-electric cells arranged at suitable heights or by making use of any other means capable of assuring the operations to be carried out by the controlling mechanism.

What we claim is:

1. In a drawing-off mechanism for a loom having fabric producing implements, a device which may be selectively operated to control the density of the weft in various zones of a fabric produced by the loom, said device comprising: draw-ofi members rotatable in predetermined timed relationship with the fabric producing implements of the loom, a path defined between said draw oif members through which said fabric is caused to move at a predetermined speed by said draw-off members, sclectively operable selecting means drivingly cooperating with said draw-off members to selectively vary their speed of rotation with respect to the speed of the fabric producing implements of the loom from said predetermined speed to a difierent predetermined speed thereby to vary the drawing-off speed at which the fabric is caused to move through said defined path whereby the density of the weft will be predeterminately varied in predetermined zones of the fabric, and setting means operable in dependence on the drawing-off of the fabric for a selective operation of said selecting means, said setting means including a controlling means engaged with and operated by the fabric drawn off by said draw-off members.

2. In a drawing-off mechanism for a loom having fabric producing implements, a device which may be selectively operated to control the density of the weft in vari ous zones of a fabric produced by the loom, said device comprising: draw-off members rotatable in predetermined timed relationship with the fabric producing implements of the loom, a path defined between said draw-0E members through which said fabric is caused to move at a predetermined speed by said draw-off members, selectively operable selecting means drivingly cooperating with said draw-ofi members to selectively vary their speed of rotation with respect to the speed of the fabric producing implements of the loom from said predetermined speed to a different predetermined speed thereby to vary the drawing-off speed which the fabric is caused to move through said defined path whereby the density of the weft will be predeterminately varied in predetermined zones of the fabric, electric means operatively connected with said selecting means for a selective operation thereof, and automatic controlling means electrically connected with said electric means for operating same during predetermined intervals, said automatic controlling means including a rotatable elementengaged with and operated by the fabric drawn off by said draw-off members, rotatable cam means, and a switch electrically connected with said electric means, said cam means being operatively connected with said rotatable element and having at least one zone for actuating said switch during a predetermined portion of its rotation.

3. In a loom, the combination of: a drive for the operation of the loom, actuatable drawing-off means for drawing-off fabric woven by implements of the loom, a change speed transmission including input means, output means and adjustable speed selecting means associated with said input means and output means for selecting the speed of said output means in a predetermined relation to the speed of said input means, said input means being operatively connected with said drive, said output means being operatively connected with said drawing-oil means, and automatic controlling means associated with said selecting means for adjusting same for the selection of a predetermined speed of the output means for a predetermined period of time, said controlling means including means operable by the fabric drawn oif by said drawingoff means.

References Cited in the file of this patent UNITED STATES PATENTS 

